schmidt



(No Model.)

A l '3I sheets-Sheet W. SCHMIDT.A Y

STEAM GENERATOR; i

Patented May 15, 1888,.

N- PETERS. Phobulmgnphlr, Washinton. D. C.

UNITED STATES PATENT OFFICE.

WILHELM SCHMIDT, OF HALBERSYTADTVPRUSSIA, GERMANY. l

ASTI-:Alvi-GENERATOR.

srncIrIcAa-Ion forming part of Letters Patent No. 382,835, atea May 15,1838. Application filed Octoberl'i, 1887. Serial No. 252,6l7`.' (No model.) Patented in Germany May 5, 1886,No. 7,287.

To a/ZZ whom it may concern.-

Be it known that I, WILHELM SHMIDT, a subject of the King of Prussia,German Emperor, residing at No. 8 Plantagen Street, Halberstadt, in the Kingdom of Prussia, German Empire, civil engineer, have invented certain new and useful Improvements in Steam-Gen# erators, (for which I have obtained a patent in Germany, No. 37,287', bearing date of May 5, 1886,) of which the following is a specification.

My invention relates to improvements. in steam-generators in which superheated steam is used for heating the steam-generator proper 5 and the object of my improvements is tov construct a steam-generator of the smallest size possible, being adapted especially for use in small manufactories-t`. e. for driving or work ing small motors and my generator consists of a tube or tubes surrounded by another tube of larger diameter, thus leavingl a space between the tubes, into which superheated steam is continually conducted, and,`when condensed, is guided off again. I attain this object by the construction of the steam-generator illustrated in the accompanying drawings, in which- Figure 1 is a sectional elevation of my improved steam-generator; Fig. 2, an elevation, partly in section, vo f a modification of the same. Fig. 3 shows another modification in sectional elevation, and Fig. 4 is a transverse section on line a; x of Fig. 3.v i

Similar letters refer to similar parts through; out the several views.

A is the furnace, and B the steam-generator, taken as a whole. The furnace `A is fed from above vthrough chute a, being provided with. a cover, b.

c is the fire-box, d the grates, and e the ashpit. Fire-box and ashpit are provided with doors c and e for pricking the coal or cleaning the ash-pit, respectively. lThe smoke or products of combustion enter the flue f through channel g, being lof tubular shape, and escape through chimney pipe h. While passing Athrough iluef the smoke surrounds spiral tube t andl imparts its heat to lthe latter, being filled in its lower part with water, which is thereby evaporated. The steam thus produced is guided into my new steam-generator B, which I may construct in different ways.

In the construction shown in Fig. l the tubes Z is the steam-boiler, being inclosed vin" pipe o r tube k. Both pipes are Vclosed at their topl and bottom ends. Pipe Zis closed by caps s and s,'having central channels,which make steamgenerator consists in ther main of twoV pipes, k and Z, of different diameters, of which l part of the inner tube or boiler, Z, being closed by conical covers ny and m, which are held in position by stays n and m', in combination with adj usting sorews pp, pressing on the cov-j ers. Boiler Z is provided with similar ports or channels,Z and Z2, and witha piston, q, being suspended from cover n by rod r, the purpose of which piston will be hereinafter described.

The superheate'dsteam being generated in spiral tube passes off from out the same through pipe i into tube k, where it imparts its heat to the boiler Z, which is filled up till 'somewhat lbelow l,the piston q with water entering into the same through pipe Z'fl near the bottom end.y Th usl by means ofthe superheated steam surrounding the boiler Z the'waterinslde the latter will be evaporated and the generated steam isguided into the motor through steamoutlet port Z. Before leaving the boiler Z the steam has to Vpass the narrow space left 'between piston q' and tube Z, where it ismore fully subjected to the heat of the superheated steambeing expended in the outside tube or steam-jacket-,k, and thus leaves the boiler fully n dried, though there is but little room left lfor the steam above the water-line of the boiler Z. The water in the steamboiler Z is continually kept up to the same level, as sufficient fresh water is always conducted into the same through pipe'Zi. When the steam of the steamjacket k has condensed,it passes out ofthe same through pipe t, back into the spiral tube i, where it is againevaporated,and is again conducted linto steam-jacketk through pipel Z. Thus the same quantity of Water is continuously evaporated and theincrustation of the tubes and jacket is prevented. l

The boiler may easily be scaled when taking off the two covers m and n. My .improved steam-generator is therefore well adapted to be used in small factories with the vgreatest safety. It is not necessary to arrange'the steam-generator B vertically. I may well construct it in the manner as is shown in Fig. 2

Ioo

of the accompanying drawings, where it is arranged nearly horizontally, for the steam of steam-j acket k surrounds the boiler just as well as in the abovedescribed construction and imparts its heat to the boiler. In this second case I have done away with the piston q, for the steam will get dry enough when passing along theupper part of boiler k.

Another modification of my steam-generator is shown in Figs. 3 and 4. The boiler` in this case consists of several tubes Z, being inserted in and surrounded by steam-jacket 7a. The tubular vessel constituting the steamjacket is extended above and below the water-pipesZ and makes part of the steam-boiler, as the steam'jaeket proper is shut off by partitions t and t', in which the boiler-tubes Zare inserted. The water enters the lower part of the boiler at Z2 and fills pipes Z, and its surface is somewhat above t-he top end of pipes Z. The steam, coming through pipe i', enters steam-jacket k, being shut off from cylinder K by the partitions t and t', and surrounds the boiler-tube Z, just as in the constructions described above, and evaporates the water within the latter. The steam thus produced passes oli` through pipe Z into the motor to be worked, and the condensed steam of the steam-jacket k enters again spiral tubes Z through pipe Z2,- also, in this case a piston is not necessary, as the exhausting-chamber of the boiler is large enough to deliver but dry steam into the motor.

The scaling of the boiler may well be done by removing covers n and m, being connected and locked to the boiler by a rod, o, passing through both covers, and being fastened to the latter by screwnutsp and p.

I am aware `that prior to my invention steamgenerators have been constructed which were provided with steam-jackets and were V heated by superheated steam.

I therefore do not claim such a combination, broadly; but

IVhat I do claim as my invention, and desire to secure by Letters Patent, is

l. A steam --generator consisting of two tubes, Z and 7c, of different diameters, being shut olf from one another, and of which the one Z is inserted in the other,k, and is provided with a steam-outlet port, Z, and water-inlet port Z2, and of which the other one, k, is connected to the boiler by means of the pipe z" at the'top and by the pipe i2 at thebottom, in combination with a directly-heated system of tubes, fZ, the steam of which is conducted into tube 7c by a pipe, and the condensed steam is v guided back into the system of tubes i through pipe Z2, for the purpose substantially as described.

2. In stearngenerators consisting of two tubes, Z and 7c, of different diameters, being shut ofic from one another, and of which the one Z is inserted in the other,k, and is provided with a steam-outlet port, Z', and water-inlet port Z2, a nd of which the other one, k, is provided with similar ports, z" and i2, in combination with a directlyheated vsystem of tubes, i, the steam of which is conducted into tube kby a pipe, i', and the condensed steam is guided back into the system of tubes Z through pipe i2, and with a piston, q, arranged inside the boiler Z above the surface of the water, for the purpose substantially as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

ILHELM SCHMIDT.

Witnesses:

B. Roi, O. MHLNER. 

